Hi,
You can find below the spec of my server:
cat /proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 15
model : 37
model name : AMD Opteron(tm) Processor 248
stepping: 1
cpu MHz : 2200.034
cache size : 1024 KB
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush mmx fxsr sse sse2 syscall nx mmxext fxsr_opt lm 3dnowext
3dnow pni lahf_lm
bogomips: 4400.06
TLB size: 1024 4K pages
clflush size: 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management: ts fid vid ttp
processor : 1
vendor_id : AuthenticAMD
cpu family : 15
model : 37
model name : AMD Opteron(tm) Processor 248
stepping: 1
cpu MHz : 2200.034
cache size : 1024 KB
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush mmx fxsr sse sse2 syscall nx mmxext fxsr_opt lm 3dnowext
3dnow pni lahf_lm
bogomips: 4399.42
TLB size: 1024 4K pages
clflush size: 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management: ts fid vid ttp
free
total used free sharedbuffers cached
Mem: 20592362049896 9340 0 98001874828
-/+ buffers/cache: 1652681893968
Swap: 40959921124095880
Linux 1-NFS.domain.com 2.6.18-164.9.1.el5 #1 SMP Tue Dec 15 20:57:57 EST 2009
x86_64 x86_64 x86_64 GNU/Linux
--- Physical volume ---
PV Name /dev/sdc1
VG Name vgspace
PV Size 4.55 TB / not usable 1.97 MB
Allocatable yes
PE Size (KByte) 4096
Total PE 1192067
Free PE 795267
Allocated PE 396800
--- Physical volume ---
PV Name /dev/sdd1
VG Name vgspace
PV Size 4.55 TB / not usable 1.97 MB
Allocatable yes
PE Size (KByte) 4096
Total PE 1192067
Free PE 808067
Allocated PE 384000
I need ext4 for file bigger than 2TB.
/dev/mapper/vgspace-vol1 on /vol/vol1 type ext4 (rw,noatime)
/dev/mapper/vgspace-vol2 on /vol/vol2 type ext4 (rw,noatime)
# tune2fs -l /dev/mapper/vgspace-vol1
tune2fs 1.39 (29-May-2006)
tune2fs: Filesystem has unsupported feature(s) while trying to open
/dev/mapper/vgspace-vol1
Couldn't find valid filesystem superblock.
# tune2fs -l /dev/mapper/vgspace-vol2
tune2fs 1.39 (29-May-2006)
tune2fs: Filesystem has unsupported feature(s) while trying to open
/dev/mapper/vgspace-vol2
Couldn't find valid filesystem superblock.
export nfs :
/vol/vol1 192.168.*.0/255.255.255.0(async,no_subtree_check,rw,no_root_squash)
/vol/vol2 192.168.*.0/255.255.255.0(async,no_subtree_check,rw,no_root_squash)
Best regards
Fabien FAYE
- Original Message -
From: Jim Perrin jper...@gmail.com
To: CentOS mailing list centos@centos.org
Sent: Monday, January 25, 2010 2:27:41 PM
Subject: Re: [CentOS] Too much cpu wait on nfs server when we need to read
data on it
On Mon, Jan 25, 2010 at 8:39 AM, fabien faye fab...@faye.eu wrote:
Hi,
I have a big server with 24 Disk on 2 3ware card.
Define 'big'. You're not giving much in terms of memory or cpu specs.
When i write data on my nfs server everything is fine but when i want to read
data i have a lot of cpu wait.
Okay. Have you looked at any performance tuning or elevator/scheduler
adjustments? File system tuning? What have you tried on your own so
far to debug this?
about the file system, i use ext4 on LVM partition.
Why? Is there a performance reason for you to use ext4 vs ext3?
Do you have any idea about that.
Not based on the little information you've provided. It would help for
you to supply more detail, and the things you've already looked at.
--
During times of universal deceit, telling the truth becomes a revolutionary act.
George Orwell
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